Method of and machine for sealing seams



Oct. 24, 1933- 1-. RQBlNSQN 1,931,629

IBTHOD OF AND MACHINE FOR SEALING SBAIS Filed Jan. 29, 1931 l 2 Sheets-Sheet 1 l N v E N TO R flex/03 755/2150.

q ATTORNEY5 Oct. 24, 1933.

F. T. ROBINSON 1,931,629

IETHOD OF AND MACHINE FOR SEALING SEARS Filed Jan. 29, 1931 2 Sheets-Sheet 2 Ill . s&

ATTORNEY;

Patented Oct. 24, 1933 Ms'rnon OF AND MACHINE FOR SEALING SEAMS Francis T. Robinson, Rockville Center, N. Y., assignor to Arkell Safety Bag Company, New York, N. Y., a corporation of New York Application January 29, 1931. Serial No. 512,035

10 Claims. (01. 1 54 42) My .invention relates to amethod of and machine for sealing seams, more especially sewed seams of moisture proof bags such as bags made of waxed paper, crinkled paper, textile fabric or crinkled paper' lined fabric. Moisture-proof bags of this nature are commonly made from a sheet of the waterproofed material which is folded over upon itself and has its longitudinal edges and the edges at one'end turned over and secured by a line of stitching. Owing to the holes formed by the sewing needle in. stitching the seams, it is necessary to seal the seams after stitching. Heretofore, I this has usually been done by dipping the seams in paraffin so as-to cover the stitches and needle holes. Such dipping of the seams, however, is a slow and expensive operation and moreover is not satisfactory as the paraffin in cooling is likely to be unevenly distributed,-too little paraffin occurring in some 20 places and such large quantities in other places that it is likely to break off when the bag is in use. 7

One of the objects of the present invention is to provide a method of and machine for sealing sewed seams of the character indicated whereby effective and uniform sealing is insured.

Another object of the invention is to provide a method of the character indicated which may be carried out inexpensively and expeditiously.

Another object of the invention is to provide a machine which is particularly adapted for use in carrying out the method.

The several features of the invention, whereby the above mentioned and other objects may be attained, will be readily understood from the following description and accompanying drawings, in which:

Figure 1 is a longitudinal sectional view, partly in elevation, of my improved machine in its pre- 40 ferred form, the section being shown as taken substantially on the line 1-1 of Fig. 2;

Fig. 2 is a transverse sectional View taken on the line 2- 2 of Fig. 1;

Fig. 3 is a detail sectional view taken on the line 3-3 of Fig. l;

Fig. 4 is a side elevation of a crinkled paper bag or lining having the seams thereof sealed in accordance with my invention; and

Fig. 5 is a detail sectional view taken on the line 55 of Fig. 3. I

The machine illustrated in the drawings, is particularly adapted for use in sealing the seams of a bag 2 (Fig. 4) which may be formed by folding a sheet of material upon itself and turning over the longitudinal edges of the sheet and securingthem'together by a line of stitches 4, one end of the bag being closed by a similarseam 6. The machine illustrated in the drawings, is provided with a work-supporting table 8' having on the front thereof a guide 10 and having an opening 12 into which the contacting portions of a pair of rolls 14 extend. These rolls 14 are of hollow construction. and means are provided for circulating steam or other heating fluid through the rolls so as to maintain them at the required temperature, and for driving the rolls andpressing them together. As shown the lower roll is mounted on the end of a tubular shaft 16 which extends through and is journaled in a bearing 18 in a standard 20 forming a part'of the machine frame. This roll'carrying shaft 16 is driven by a sprocket wheel 22, secured thereon, which in turn is driven by a sprocket chain The upper roll 14 is carriedon the end of a hollow shaft 26 which extends through and is journaled in a bearing 28 in a block 30' which is mounted to slide vertically inguideways 32 into the frame standard 20'. The upper roll 14 is pressed downwardly toward the lower roll by meansof a coiled spring 34 which is interposed between the block 30 and across bar 36 on the upper end of the standard 29. The upper roll 14 is'driven in unison with the lower roll by means of intermeshinggears 38, respectively, secured on the shafts 16.

Each of the roll shafts 16 and 26 is rigidly con-- nected by a coupling member 40 with a shaft section 42 that has its outer end extending through a stufling b x 44 formed. on one end of a T-joint 46. The interior of both of these ii-joints isconnected with a steam outlet pipe 48. Steam is supplied to the interior of each of the hollow rolls 14 by means of a steam pipe 50 which extends axially through each of the hollow shafts 16 and 26 and through the T-joints 46, and their outer ends are connected with a steam supply pipe 52. With this construction the steam passes from the steam supply pipe 52 through the pipes'50 andinto the hollow rolls 14, and passes out from 6 the rolls through the hollow shafts 16 and 26 and exhaust pipe 48. s

' The lower portion of the roll 14 is partially submerged in melted parafiin or other sealing material in a tank 54 supported on the machine frame and having an overflow pipe 56.

Paraffin, or other sealing material in melted condition, may be supplied to the peripheral surface of the upper roll through a pipe 58 having a stop-cock 60 on the end thereof 'for directing the material toward said surface, the steam pipe being maintained at the required temperature by means of a steam jacket (not shown) or other suitable means.

In operating the machine in accordance with my improved method, the article, such as the bag 2, is positioned ,on the table 8 with the outer edge of the seam to be treated against the guide 10, the position of the guide determining the width of the coating to be applied to the seam. Ihe article is then presented to the rotating rolls l4 and is carried by the rolls between them, the edge of the article being guided by the guide 10. As the article thus passes between the rolls, the melted paraffin, or other sealing material, supplied to the surface of the rolls in highly fluid bondition is deposited on both sides of the seam of the article and as the article passes between the rolls, the coating of sealing material thus applied is firmly pressed on the surfaces of the seams. finch application of the sealing material insures t a it' h eu i ee e es t ber o h material ,of the bag, fills the needle holes in the seam about the stitches, and thoroughly seals the tprned over portions of the seam.

When ,one seam has thus been treated, the article may be turned and run through the rolls to apply the sealing material to the other seam.

When the seams .of the bags have thus been run th tehgh th m h n t e ee may he aced stacks to allow the sealing material to dry, the sealing material being so impregnated into the m t r el o t e has that it is unn ssa to a g up the bags to ,dry as has been the practiceheree tofore where the sealing material'is applied by d p n h s me- It will h app teh tha i a eerd hee wi h m improted m thod an ma h ne the e ling mat rial may be uniformly and effectively applied to the seams; that but a amount ,of sealing m te i l ne d b mp o d an th t the ethod may be performed ineapensiyely ,and expeditions.- y

Wh he c a ms specify nerafi n as the h a in m te i it i to e uh e e eed tha t i e m .i merely used as illustrative and that other similar eee hl m t ia m e ike em lo d es Wi l be v d t e thes sk led n he a t my invention permits various modifications with.' out d art n it m th i it h reo or h cope of the appended claims.

What I ,claim is l,- Th m t e e sea ng sewed s ems e the elaee de er h d whieh c m i e pl ing areifi-h in me ed eondi ieh to the n ap l in P ZQS LH'? t t e t u r at s am while he paraflin thereon is in melted condition so to hs he me d a a in he he rhed in o th dle hel d hohi h her hs Of the hr ad ext nd n i r i nehsh 2. The n'iethrxl 9f sealing sewed seams of the class described WhiQh comprises applying melted ara ih to o osit si s of th se m an ap lyh hea and pres ure to th t u h a ed eem s h be pau e the m d er fiin t h o e nto the ne d hol s an abou h peri hi t thread extending therethrough.

. Tlihe meihe l o seal n he eam o a h s of similar article that is formed by turning over adjacent edges and stitching them together which comprises coating both sides of the seam with paraffin in melted condition, and applying pressure to the two' sides of the seam while the paraffin is in melted condition.

.4. The method of sealing'sewed seamsof the class described which comprises applying paramn in melted condition to opposite sides of the seam,

and applying a rolling pressure to the thus coated seam while the paraiiin is in melted condition so as to cause the melted paraffin to be forced into the needle holes and about the portions of the thread extending therethrough.

5. In a machine for sealing seams of the class described, the combination of rolls to which the seam of the article to be treated is presented, means for heating the rollers, means for rotating the rollers to feed the scam of the article longitudinally between them, means for applying paraffin in melted condition to the surface of the rollers, and means for pressing the rolls toward each o'lher whereby the seam as it passes between the rollers is coated on both sides with the melted paraffin and pressure is applied to the coated surfaces while the paraffin is in melted condition.

6. In a machine for sealing seam of the class described, the combination or ro'lating rolls bee tween which the seam is fed, means for applying paraiiin to the surface'of at least one of the rollers whereby the paraifin while incmelted condition is transferred to the seam, and means for 'cause ing the rolls to apply pressure to the seam.

7. In a machine forsealing seams of the class described, the combination of a pair of hollow rolls arranged one above the other, means for circulating heating fluid through the rolls, means for pressing one of the rolls toward the, other roll, means for guiding the seam of the article to be treated longitudinally between the rolls, a tank for containing melted paraifin into which the lower portion ,of the lower roll extends, means for applying melted paraffin to the peripheral surface of the upper roll, and means for driving the rolls to feed the seam between them.

,8. In, a machine for sealing seams of the class described, the combination of means for apply.- ing paraffin in melted condition to the seam, and means for applying heat and pressure to the thus treated seam while the paraffin is in meltedcondition. e

9. The method of sealing the seam of a bag or similar article made of crinkled paper coated with paramn, the seam being formed by turning over adjacent edges and stitching them together, which comprises applying melted parafiin over the stitches of the and applying heat and pressure to the thustreated seam.

10. The method of sealing a sewed'searn of a bag or similar article made of crinkled paper coated with paraffin, which comprises applying melted paraffin over the stitches of the seam, and applying heat and, pressure to. the thus treated seam so as to cause the melted paraffin to be forced about the portions of the stitches 

